JP3686670B1 - Exhaust purification device - Google Patents

Exhaust purification device Download PDF

Info

Publication number
JP3686670B1
JP3686670B1 JP2004316046A JP2004316046A JP3686670B1 JP 3686670 B1 JP3686670 B1 JP 3686670B1 JP 2004316046 A JP2004316046 A JP 2004316046A JP 2004316046 A JP2004316046 A JP 2004316046A JP 3686670 B1 JP3686670 B1 JP 3686670B1
Authority
JP
Japan
Prior art keywords
cooling water
reducing agent
engine
valve
exhaust
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP2004316046A
Other languages
Japanese (ja)
Other versions
JP2006125331A (en
Inventor
博一 佐藤
充広 仁科
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
UD Trucks Corp
Original Assignee
UD Trucks Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by UD Trucks Corp filed Critical UD Trucks Corp
Priority to JP2004316046A priority Critical patent/JP3686670B1/en
Application granted granted Critical
Publication of JP3686670B1 publication Critical patent/JP3686670B1/en
Priority to PCT/JP2005/017287 priority patent/WO2006046369A1/en
Priority to EP05785681.7A priority patent/EP1806487B1/en
Priority to CNB2005800376146A priority patent/CN100529342C/en
Publication of JP2006125331A publication Critical patent/JP2006125331A/en
Priority to US11/790,739 priority patent/US7805930B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9404—Removing only nitrogen compounds
    • B01D53/9409—Nitrogen oxides
    • B01D53/9431—Processes characterised by a specific device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2067—Urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
    • F01N2550/05—Systems for adding substances into exhaust
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/08—Parameters used for exhaust control or diagnosing said parameters being related to the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
    • F01N2900/1806—Properties of reducing agent or dosing system
    • F01N2900/1811—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Abstract

【課題】 還元剤の凍結防止のために還元剤を貯蔵する還元剤タンクに配管されたエンジンの冷却水循環配管内に冷却水が滞留するの防止しようとする排気浄化装置を提供する。
【解決手段】 前記エンジン１により加熱される冷却水の通路の一部を前記尿素水タンク６に導いて、該尿素水タンク６内に貯蔵された尿素水の凍結防止又は凍結した尿素水の解凍をする冷却水循環配管８と、該冷却水循環配管８の途中に設けられ、該冷却水循環配管８の通路を開閉して冷却水の循環及び循環停止をする冷却水遮断弁９と、該冷却水遮断弁９の開閉動作を制御する制御手段１０とを備えて、該制御手段１０により、エンジン始動時に所定時間だけ冷却水遮断弁９を開き冷却水循環配管８に冷却水を循環させるものである。
【選択図】 図２ PROBLEM TO BE SOLVED: To provide an exhaust purification device for preventing cooling water from staying in a cooling water circulation pipe of an engine piped to a reducing agent tank for storing the reducing agent for preventing freezing of the reducing agent.
SOLUTION: A part of a passage of cooling water heated by the engine 1 is led to the urea water tank 6 to prevent freezing of urea water stored in the urea water tank 6 or to defrost frozen urea water. A cooling water circulation pipe 8 for performing cooling, a cooling water shut-off valve 9 provided in the middle of the cooling water circulation pipe 8 for opening and closing the passage of the cooling water circulation pipe 8 to circulate and stop circulation of the cooling water, and the cooling water cutoff And a control means 10 for controlling the opening and closing operation of the valve 9. The control means 10 opens the cooling water shut-off valve 9 for a predetermined time when the engine is started, and circulates the cooling water through the cooling water circulation pipe 8.
[Selection] Figure 2

Description

本発明は、移動車両搭載のディーゼルエンジン、ガソリンエンジン等から排出される窒素酸化物（ＮＯｘ）を、噴射ノズルで還元剤を還元触媒の排気上流側に噴射して還元除去するエンジンの排気浄化装置に関し、詳しくは、エンジンにより加熱される冷却水の通路の一部を還元剤タンクに導いて、該還元剤タンク内の還元剤の凍結を防止する冷却水循環配管内に冷却水が滞留するのを防止しようとする排気浄化装置に係るものである。   The present invention relates to an engine exhaust purification device that reduces and removes nitrogen oxide (NOx) discharged from a diesel engine, a gasoline engine or the like mounted on a moving vehicle by injecting a reducing agent to an exhaust upstream side of a reduction catalyst with an injection nozzle. Specifically, the cooling water stays in the cooling water circulation pipe that guides part of the cooling water passage heated by the engine to the reducing agent tank and prevents the reducing agent in the reducing agent tank from freezing. The present invention relates to an exhaust purification device to be prevented.

エンジンから排出される排気中の有害物質のうち、特にＮＯｘを除去して排気を浄化するシステムとして、いくつかの排気浄化装置が提案されている。この排気浄化装置は、エンジンの排気系に還元触媒を置き、該還元触媒の上流側の排気通路に還元剤を噴射供給することにより、排気中のＮＯｘと還元剤とを触媒還元反応させ、ＮＯｘを無害成分に浄化処理するものである。還元剤は還元剤タンクに常温で液体状態に貯蔵され、必要量を噴射ノズルから噴射供給する。還元反応は、ＮＯｘとの反応性のよいアンモニアを用いるもので、還元剤としては、加水分解してアンモニアを容易に発生する尿素水溶液、アンモニア水溶液、その他の還元剤水溶液が用いられる（例えば、特許文献１参照）。   Several exhaust purification devices have been proposed as a system for purifying exhaust gas by removing NOx in particular from harmful substances in exhaust gas discharged from the engine. This exhaust purification device places a reduction catalyst in an exhaust system of an engine, and injects and supplies a reducing agent into an exhaust passage upstream of the reduction catalyst, thereby causing NOx and reducing agent in the exhaust to undergo a catalytic reduction reaction. Is purified to harmless components. The reducing agent is stored in a reducing agent tank in a liquid state at room temperature, and a required amount is injected and supplied from an injection nozzle. The reduction reaction uses ammonia that has good reactivity with NOx, and as the reducing agent, an aqueous urea solution, an aqueous ammonia solution, or other reducing agent aqueous solution that easily generates ammonia by hydrolysis is used (for example, patents). Reference 1).

この種の排気浄化装置は、例えば還元剤として尿素水を使用している場合に、北海道等の寒冷地において気温が−１１℃以下となったときには、還元剤タンクに貯蔵された尿素水が凍結する場合があった。このような問題に対しては、エンジンの冷却水通路の一部を冷却水循環配管で還元剤タンクに導いて、エンジンの始動により加熱された冷却水の一部を冷却水循環配管に循環させて尿素水の凍結防止又は凍結した尿素水を解凍させることが考えられる。
特開２０００−２７６２７号公報 In this type of exhaust purification device, for example, when urea water is used as a reducing agent, the urea water stored in the reducing agent tank is frozen when the temperature becomes -11 ° C. or lower in a cold district such as Hokkaido. There was a case. To solve this problem, part of the cooling water passage of the engine is led to the reducing agent tank by the cooling water circulation pipe, and a part of the cooling water heated by the engine start is circulated to the cooling water circulation pipe. It is conceivable to prevent water from being frozen or to thaw frozen urea water.
JP 2000-27627 A

しかし、還元剤タンクに冷却水循環配管を設けてエンジンの冷却水を循環させるものにおいては、尿素水の凍結の虞が無くなった時期には、冷却水の循環を停止するため、冷却水循環配管内に冷却水が滞留して水あかが付く虞がある。   However, in the case where the cooling water circulation pipe is provided in the reducing agent tank and the cooling water of the engine is circulated, the cooling water circulation is stopped when there is no risk of freezing of the urea water. There is a risk that the cooling water may accumulate and cause water scuffing.

そこで、本発明は、このような問題点に対処し、エンジンにより加熱される冷却水の通路の一部を還元剤タンクに導いて、該還元剤タンク内の還元剤の凍結を防止する冷却水循環配管内に冷却水が滞留するのを防止しようとする排気浄化装置を提供することを目的とする。   Accordingly, the present invention addresses such a problem and introduces a part of the cooling water passage heated by the engine to the reducing agent tank to prevent freezing of the reducing agent in the reducing agent tank. An object of the present invention is to provide an exhaust emission control device that attempts to prevent cooling water from staying in piping.

上記目的を達成するために、本発明による排気浄化装置は、エンジンの排気系に配設され、排気中の窒素酸化物を還元剤により還元浄化する還元触媒と、前記還元剤を貯蔵した還元剤タンクと、該還元剤タンクから還元剤供給手段を介して供給される還元剤を前記排気系の排気通路内にて前記還元触媒の排気上流側に噴射する噴射ノズルとを備えたエンジンの排気浄化装置であって、前記エンジンにより加熱される冷却水の通路の一部を前記還元剤タンクに導いて、該還元剤タンク内に貯蔵された還元剤の凍結防止又は凍結した還元剤の解凍をする冷却水循環配管と、該冷却水循環配管の途中に設けられ、該冷却水循環配管の通路を開閉して冷却水の循環及び循環停止をする冷却水遮断弁と、該冷却水遮断弁の開閉動作を制御する制御手段とを備えて、該制御手段により、エンジン始動時に所定時間だけ前記冷却水遮断弁を開き前記冷却水循環配管に冷却水を循環させるものである。   In order to achieve the above object, an exhaust emission control device according to the present invention is provided in an exhaust system of an engine to reduce and purify nitrogen oxides in exhaust gas with a reducing agent, and a reducing agent that stores the reducing agent. Exhaust gas purification of an engine comprising a tank and an injection nozzle for injecting a reducing agent supplied from the reducing agent tank through a reducing agent supply means into an exhaust upstream side of the reduction catalyst in an exhaust passage of the exhaust system A device that guides a part of a passage of cooling water heated by the engine to the reducing agent tank to prevent freezing of the reducing agent stored in the reducing agent tank or to thaw the frozen reducing agent. A cooling water circulation pipe, a cooling water shut-off valve that is provided in the middle of the cooling water circulation pipe, opens and closes the passage of the cooling water circulation pipe to circulate and stop the cooling water, and controls the opening and closing operation of the cooling water shut-off valve Control means to Provided, by the control means, in which circulating cooling water to the cooling water circulation pipe open only the cooling water shut-off valve a prescribed time when the engine starts.

このような構成により、エンジンにより加熱される冷却水の通路の一部を還元剤タンクに導いて、該還元剤タンク内に貯蔵された還元剤の凍結防止又は凍結した還元剤の解凍をする冷却水循環配管の途中に設けられた冷却水遮断弁を制御手段でエンジン始動時に所定時間だけ開き、上記冷却水循環配管に冷却水を循環させる。   With such a configuration, part of the cooling water passage heated by the engine is guided to the reducing agent tank, and the reducing agent stored in the reducing agent tank is prevented from freezing or cooled to defrost the reducing agent. A cooling water shut-off valve provided in the middle of the water circulation pipe is opened by the control means for a predetermined time when the engine is started, and the cooling water is circulated through the cooling water circulation pipe.

また、前記制御手段は、前記各構成要素の所定の部位に設けられた各種センサーの検出出力に基づいて、（ａ）エンジンの始動、（ｂ）大気温度≦所定値、（ｃ）還元剤供給手段の温度≦所定値、（ｄ）還元剤タンク内の温度≦所定値、（ｅ）エンジンの回転数≧所定値の、少なくともいずれか一つの条件が満たされていないと判断したときに、前記冷却水遮断弁を所定時間だけ開くものである。これにより、各構成要素の所定部位に備えた各種センサーの検出出力に基づいて、制御手段でエンジンの始動、大気温度≦所定値、還元剤供給手段の温度≦所定値、還元剤タンク内の温度≦所定値、エンジンの回転数≧所定値の、各条件を判断し、該各条件の少なくともいずれか一つが満たされていないと判断すると冷却水遮断弁を所定時間だけ開く。   Further, the control means is based on detection outputs of various sensors provided at predetermined portions of the respective components, based on (a) engine start, (b) atmospheric temperature ≦ predetermined value, and (c) reducing agent supply. When it is determined that at least one of the following conditions is not satisfied: (d) temperature in the reducing agent tank ≦ predetermined value, (e) engine rotational speed ≧ predetermined value The cooling water shut-off valve is opened for a predetermined time. Thus, based on detection outputs of various sensors provided in predetermined parts of each component, the control means starts the engine, the atmospheric temperature ≦ predetermined value, the temperature of the reducing agent supply means ≦ predetermined value, the temperature in the reducing agent tank ≤ Predetermined value, engine speed ≥ Predetermined conditions are determined, and if it is determined that at least one of the conditions is not satisfied, the coolant shutoff valve is opened for a predetermined time.

さらに、前記制御手段は、前記エンジン始動時の所定時間内に前記冷却水の温度が所定温度以上に上昇したときには、前記冷却水遮断弁を閉じるものである。これにより、エンジン始動時の所定時間内に冷却水の温度が所定温度以上に上昇したときには、制御手段で冷却水遮断弁を閉じる。   Further, the control means closes the cooling water shut-off valve when the temperature of the cooling water rises above a predetermined temperature within a predetermined time when the engine is started. Thereby, when the temperature of the cooling water rises above the predetermined temperature within a predetermined time when the engine is started, the cooling water shut-off valve is closed by the control means.

そして、前記制御手段は、前記全ての条件が満たされているときには、前記冷却水遮断弁を開いて前記還元剤タンクの還元剤の凍結防止又は解凍動作をさせるものである。これにより、上記全ての条件が満たされているときには、制御手段で冷却水遮断弁を開いて還元剤タンクの還元剤の凍結防止又は解凍動作をさせる。   The control means opens the cooling water shut-off valve to prevent the reducing agent in the reducing agent tank from being frozen or thawed when all the conditions are satisfied. Thus, when all the above conditions are satisfied, the control means opens the cooling water shutoff valve to prevent the reducing agent in the reducing agent tank from being frozen or thawed.

請求項１に係る発明によれば、エンジンにより加熱される冷却水の通路の一部を還元剤タンクに導いて、該還元剤タンク内に貯蔵された還元剤の凍結防止又は凍結した還元剤の解凍をする冷却水循環配管の途中に設けられた冷却水遮断弁をエンジン始動時に所定時間だけ開いて、エンジンの冷却水の一部を冷却水循環配管内に循環させるものとしたことにより、冷却水循環配管内に冷却水が滞留するの防止することができる。したがって、例えば、凍結の虞が無くなった時期に冷却水の循環を停止した場合にも、冷却水循環配管内に水あかが付くのを防止することができる。   According to the first aspect of the present invention, a part of the passage of the cooling water heated by the engine is guided to the reducing agent tank to prevent the reducing agent stored in the reducing agent tank from being frozen or the frozen reducing agent. The cooling water circulation pipe is provided by opening the cooling water shut-off valve provided in the middle of the defrosting cooling water circulation pipe for a predetermined time when starting the engine and circulating a part of the engine cooling water into the cooling water circulation pipe. It is possible to prevent the cooling water from staying inside. Therefore, for example, even when the circulation of the cooling water is stopped at the time when there is no risk of freezing, it is possible to prevent water from getting in the cooling water circulation pipe.

また、請求項２に係る発明によれば、エンジンの始動、大気温度≦所定値、還元剤供給手段の温度≦所定値、還元剤タンク内の温度≦所定値、エンジンの回転数≧所定値の、各条件の少なくともいずれか一つが満たされていないとき、冷却水遮断弁を所定時間だけ開くものとしたことにより、滞留防止の冷却水循環動作の判断が容易になる。   According to the second aspect of the present invention, engine start, atmospheric temperature ≦ predetermined value, reducing agent supply means temperature ≦ predetermined value, reducing agent tank temperature ≦ predetermined value, engine speed ≧ predetermined value When at least one of the conditions is not satisfied, the cooling water shutoff valve is opened for a predetermined time, so that it is easy to determine the cooling water circulation operation for preventing the stagnation.

さらに、請求項３に係る発明によれば、エンジン始動時の所定時間内に冷却水の温度が所定温度以上に上昇したときには、制御手段で冷却水遮断弁を閉じるものとしてことにより、加熱された冷却水で還元剤タンク内の還元剤、例えば尿素水の温度が上昇してアンモニアが発生するのを防止することができる。   Furthermore, according to the invention of claim 3, when the temperature of the cooling water rises above the predetermined temperature within a predetermined time at the time of starting the engine, the cooling water shut-off valve is closed by the control means. It is possible to prevent ammonia from being generated due to an increase in the temperature of the reducing agent in the reducing agent tank such as urea water due to the cooling water.

そして、請求項４に係る発明によれば、上記各条件が全て満たされているときには、冷却水遮断弁を開いて還元剤タンクの還元剤の凍結防止又は解凍動作をさせるものとしたことにより、還元剤の凍結防止又は解凍動作の判断が容易になる。   And according to the invention which concerns on Claim 4, when all the said conditions are satisfy | filled, by opening a cooling water shut-off valve and carrying out the freezing prevention or thawing | decompression operation | movement of the reducing agent of a reducing agent tank, It is easy to determine whether the reducing agent is frozen or thawed.

以下、本発明の実施形態を添付図面に基づいて詳細に説明する。図１は本発明による排気浄化装置の実施形態を示す概念図である。この排気浄化装置は、移動車両に搭載のディーゼルエンジン、ガソリンエンジン等から排出されるＮＯｘを、還元剤を用いて還元除去するものであり、ガソリンあるいは軽油を燃料とするエンジン１の排気を排気マニフォールド２から大気中に排出させる排気管３にＮＯｘの還元触媒４と、噴射ノズル５とを備え、この噴射ノズル５に連結された尿素水タンク６と、尿素水供給手段７とを備え、さらに上記エンジン１と尿素水タンク６との間に冷却水循環配管８と、冷却水遮断弁９と、制御手段１０とを備えてなる。   Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a conceptual diagram showing an embodiment of an exhaust emission control device according to the present invention. This exhaust purification device reduces and removes NOx discharged from a diesel engine, a gasoline engine or the like mounted on a moving vehicle by using a reducing agent, and exhausts the exhaust of the engine 1 using gasoline or light oil as an exhaust manifold. 2 includes a NOx reduction catalyst 4 and an injection nozzle 5 in an exhaust pipe 3 that is exhausted into the atmosphere, a urea water tank 6 connected to the injection nozzle 5, and a urea water supply means 7. A cooling water circulation pipe 8, a cooling water shutoff valve 9, and a control means 10 are provided between the engine 1 and the urea water tank 6.

上記排気管３の排気口３ａ近傍には、ＮＯｘの還元触媒４が設けられている。このＮＯｘの還元触媒４は、排気管３内を通る排気中のＮＯｘを還元剤により還元浄化するもので、例えばセラミックのコーディライトやＦｅ−Ｃｒ−Ａｌ系の耐熱鋼から成るハニカム形状の横断面を有するモノリスタイプの触媒担体に、ゼオライト系の活性成分が担持されている。そして、上記触媒担体に担持された活性成分は、還元剤の供給を受けて活性化し、排気中のＮＯｘを効果的に無害物質に浄化させる。   In the vicinity of the exhaust port 3 a of the exhaust pipe 3, a NOx reduction catalyst 4 is provided. The NOx reduction catalyst 4 is for reducing and purifying NOx in the exhaust gas passing through the exhaust pipe 3 with a reducing agent. For example, the honeycomb-shaped cross section made of ceramic cordierite or Fe-Cr-Al heat-resistant steel A zeolite-type active component is supported on a monolith type catalyst carrier having the following. The active component carried on the catalyst carrier is activated by the supply of the reducing agent, and effectively purifies NOx in the exhaust gas into a harmless substance.

上記還元触媒４の排気上流側には、噴射ノズル５が設けられている。この噴射ノズル５は、後述の尿素水タンク６から尿素水供給手段７を介して供給される尿素水を上記排気管３内にて上記還元触媒４の排気上流側に噴射するものであり、ノズル先端５ａを排気下流側に折り曲げて尿素水を還元触媒４に向けて矢印Ａ方向に噴射するようになっている。   An injection nozzle 5 is provided on the exhaust upstream side of the reduction catalyst 4. The injection nozzle 5 injects urea water supplied from a urea water tank 6 (described later) via urea water supply means 7 into the exhaust pipe 3 to the exhaust upstream side of the reduction catalyst 4. The tip 5a is bent toward the exhaust downstream side, and urea water is injected toward the reduction catalyst 4 in the direction of arrow A.

上記噴射ノズル５には、尿素水供給配管１１を介して尿素水タンク６が連結されている。この尿素水タンク６は、還元剤としての尿素水を貯蔵する還元剤タンクとなるものである。   A urea water tank 6 is connected to the injection nozzle 5 via a urea water supply pipe 11. The urea water tank 6 is a reducing agent tank that stores urea water as a reducing agent.

また、上記噴射ノズル５と尿素水タンク６との間には、上記尿素水供給配管１１の途中に尿素水供給手段７が設けられている。この尿素水供給手段７は、上記尿素水タンク６から尿素水を吸い上げて噴射ノズル５に供給する還元剤供給手段となるものであり、図２に示すように尿素水タンク６に接続した尿素水供給配管１１ａにより尿素水を矢印Ｂ方向に吸引し、尿素水タンク６に接続した尿素水戻し配管１２により上記吸引した尿素水の一部を矢印Ｃ方向に尿素水タンク６に戻すポンプ部１３と、該ポンプ部１３に尿素水供給配管１１ｂで接続されると共に上記噴射ノズル５に尿素水供給配管１１ｃで接続されてポンプ部１３から矢印Ｄ方向に供給される尿素水に高圧エアを混合して噴射ノズル５に送出する混合部１４とを備えている。   A urea water supply means 7 is provided between the spray nozzle 5 and the urea water tank 6 in the middle of the urea water supply pipe 11. The urea water supply means 7 serves as a reducing agent supply means that sucks urea water from the urea water tank 6 and supplies it to the injection nozzle 5. As shown in FIG. 2, urea water connected to the urea water tank 6 is used. A pump unit 13 for sucking urea water in the direction of arrow B by the supply pipe 11a and returning a part of the suctioned urea water to the urea water tank 6 in the direction of arrow C by the urea water return pipe 12 connected to the urea water tank 6; The high pressure air is mixed with the urea water that is connected to the pump unit 13 through the urea water supply pipe 11b and connected to the injection nozzle 5 through the urea water supply pipe 11c and is supplied from the pump unit 13 in the direction of arrow D. And a mixing unit 14 for feeding to the spray nozzle 5.

ここで、本発明においては、図２に示すように上記尿素水タンク６には、エンジン１の冷却水通路と接続して冷却水循環配管８が設けられている。この冷却水循環配管８は、エンジン１により加熱される冷却水の通路の一部を尿素水タンク６に導いて、該尿素水タンク６内に貯蔵された尿素水の凍結防止又は凍結した尿素水の解凍をするためのものであり、その配管の一部を尿素水タンク６の内部に導入し、配管内を流れるエンジン１で加熱された冷却水の熱を配管の側壁を通して尿素水側に移動させて尿素水を保温するようになっている。このとき、エンジン１の冷却水の一部は、冷却水循環配管８を同図に示す矢印Ｅ，Ｆ，Ｇ，Ｈ方向に流れて循環する。   In the present invention, as shown in FIG. 2, the urea water tank 6 is provided with a cooling water circulation pipe 8 connected to the cooling water passage of the engine 1. The cooling water circulation pipe 8 guides a part of the passage of the cooling water heated by the engine 1 to the urea water tank 6 to prevent or freeze the urea water stored in the urea water tank 6. A part of the pipe is introduced into the urea water tank 6 and the heat of the cooling water heated by the engine 1 flowing in the pipe is moved to the urea water side through the side wall of the pipe. The urea water is kept warm. At this time, a part of the cooling water of the engine 1 flows and circulates through the cooling water circulation pipe 8 in the directions of arrows E, F, G, and H shown in FIG.

また、上記冷却水循環配管８の途中には、冷却水遮断弁９が設けられている。この冷却水遮断弁９は、冷却水循環配管８の通路を開閉して冷却水の循環及び循環停止をするものであり、例えば電磁バルブからなる。   A cooling water shut-off valve 9 is provided in the middle of the cooling water circulation pipe 8. This cooling water shut-off valve 9 opens and closes the passage of the cooling water circulation pipe 8 to circulate and stop the cooling water, and is composed of, for example, an electromagnetic valve.

そして、上記冷却水遮断弁９には、制御手段１０が接続されている。この制御手段１０は、冷却水遮断弁９の開閉動作を制御するものであり、例えばＣＰＵからなる。より詳細には、上記制御手段１０は、例えばエンジン１のオン／オフを検出するエンジン始動センサーや、外気に接する部分に設置された大気温度センサーや、ポンプ部１３の内部に設置されたポンプ部内温度センサーや、尿素水タンク６内に設置された尿素水タンク内温度センサーや、エンジン１に設置されたエンジン回転数検出センサー等の各種センサーの検出出力に基づいて、エンジン１の始動、大気温度≦所定値、尿素水供給手段７（特に、ポンプ部１３内）の温度≦所定値、尿素水タンク６内の温度≦所定値、エンジン１の回転数≧所定値、の少なくともいずれか一つの条件が満たされていないと判断したときに、上記冷却水遮断弁９を所定時間だけ開いて、図２に示すようにエンジン１から矢印Ｅ，Ｆ，Ｇ，Ｈ方向に冷却水を循環させるようになっている。また、上記エンジン始動時の所定時間内に上記冷却水の温度が所定温度以上に上昇したときには、上記冷却水遮断弁９を閉じ、上記全ての条件が満たされているときには、上記冷却水遮断弁９を開いてエンジン１の始動で加熱された冷却水の一部を冷却水循環配管８に循環させ、上記尿素水タンク６の尿素水の凍結防止又は解凍動作をさせるようになっている。   A control means 10 is connected to the cooling water shutoff valve 9. This control means 10 controls the opening / closing operation | movement of the cooling water cutoff valve 9, for example, consists of CPU. More specifically, the control means 10 includes, for example, an engine start sensor for detecting on / off of the engine 1, an atmospheric temperature sensor installed at a portion in contact with the outside air, and a pump unit installed inside the pump unit 13. Based on detection outputs of various sensors such as a temperature sensor, a urea water tank temperature sensor installed in the urea water tank 6, and an engine speed detection sensor installed in the engine 1, the start of the engine 1, the atmospheric temperature ≦ Predetermined value, temperature of urea water supply means 7 (especially in pump unit 13) ≦ predetermined value, temperature in urea water tank 6 ≦ predetermined value, engine speed 1 ≧ predetermined value Is determined to be not satisfied, the cooling water shut-off valve 9 is opened for a predetermined time, and cooling water is circulated from the engine 1 in the directions of arrows E, F, G, and H as shown in FIG. And it is adapted to. Further, when the temperature of the cooling water rises above a predetermined temperature within a predetermined time when the engine is started, the cooling water shut-off valve 9 is closed, and when all the above conditions are satisfied, the cooling water shut-off valve 9 is opened and a part of the cooling water heated by starting the engine 1 is circulated through the cooling water circulation pipe 8 to prevent the urea water in the urea water tank 6 from being frozen or thawed.

次に、このように構成された排気浄化装置の制御手段１０の制御について、図３及び図４に示すフローチャートを参照して説明する。
先ず、図３に示すステップＳ１において、制御手段１０は、上記各構成要素の所定の部位に設置された各種センサー、例えばエンジン始動センサー、大気温度センサー、ポンプ部内温度センサー、尿素水タンク内温度センサー、エンジン回転数検出センサー等の信号を読み込む。 Next, the control of the control means 10 of the exhaust purification apparatus configured as described above will be described with reference to the flowcharts shown in FIGS.
First, in step S1 shown in FIG. 3, the control means 10 includes various sensors, such as an engine start sensor, an atmospheric temperature sensor, a pump unit temperature sensor, and a urea water tank temperature sensor, which are installed in predetermined parts of the above components. Read the signal from the engine speed sensor.

ステップＳ２においては、制御手段１０は、図１に示す尿素水供給手段７及び図示省略のエンジンコントロールユニット（ＥＣＵ）を含んで構成する尿素水添加システムにエラーが無いか否かを判定する。ここで、上記尿素水添加システムにエラーが発生した場合には、尿素水添加システムに故障が発生したことを意味し、“ＹＥＳ”判定となってステップＳ３に進んで、上記システムを停止する。また、“ＮＯ”判定の場合には、ステップＳ４に進む。   In step S2, the control means 10 determines whether or not there is an error in the urea water addition system that includes the urea water supply means 7 shown in FIG. 1 and an engine control unit (ECU) (not shown). Here, if an error occurs in the urea water addition system, it means that a failure has occurred in the urea water addition system, the determination is “YES”, the process proceeds to step S3, and the system is stopped. If “NO” determination is made, the process proceeds to step S4.

ステップＳ４においては、制御手段１０は、図２に示す各種センサーからの検出出力に基づいて現在の動作状況を判断する。この場合、例えば、エンジン１の始動（IGN SW＝ON）、大気温度≦所定値、ポンプ部１３内の温度≦所定値、尿素水タンク６内の温度≦所定値、エンジン１の回転数≧所定値、の各条件が全て満たされているときには、“ＹＥＳ”判定となってステップＳ５に進む。   In step S4, the control means 10 determines the current operation status based on the detection outputs from the various sensors shown in FIG. In this case, for example, the engine 1 is started (IGN SW = ON), the atmospheric temperature ≦ predetermined value, the temperature in the pump unit 13 ≦ predetermined value, the temperature in the urea water tank 6 ≦ predetermined value, and the rotational speed of the engine 1 ≧ predetermined. When all the values are satisfied, the determination is “YES” and the process proceeds to step S5.

ステップＳ５においては、制御手段１０は、冷却水遮断弁９を開き、図２に示すように冷却水循環配管８を通してエンジン１の始動で加熱された冷却水の一部をエンジン１側から矢印Ｅ方向に導入して尿素水タンク６側に導き、さらに尿素水タンク６内を矢印Ｈ方向に流すと共に矢印Ｅ方向に流してエンジン１に戻るように循環させ、尿素水タンク６に貯蔵されている尿素水の凍結防止及び凍結した尿素水の解凍動作を行わせる。一方、ステップＳ４において、“ＮＯ”判定の場合には、図４に示すステップＳ６に進む。   In step S5, the control means 10 opens the cooling water shut-off valve 9, and a part of the cooling water heated by starting the engine 1 through the cooling water circulation pipe 8 as shown in FIG. Is introduced to the urea water tank 6 side, and further flows through the urea water tank 6 in the direction of the arrow H and also flows in the direction of the arrow E so as to return to the engine 1, and the urea stored in the urea water tank 6 is introduced. Prevent water from freezing and thaw operation of frozen urea water. On the other hand, if “NO” determination is made in step S4, the process proceeds to step S6 shown in FIG.

ステップＳ６においては、制御手段１０は、エンジン１が始動（IGN SW＝ON）しているか否かを判定する。ここで、エンジン１が始動していて、“ＹＥＳ”判定となると、ステップＳ７に進む。   In step S6, the control means 10 determines whether or not the engine 1 is started (IGN SW = ON). Here, if the engine 1 is started and “YES” is determined, the process proceeds to step S7.

ステップＳ７においては、制御手段１０は、冷却水遮断弁動作フラグの設定が初期化（未処理状態で、例えばα＝０）されているか否かを判定する。ここで、“ＹＥＳ”判定、即ち冷却水遮断弁動作フラグが初期化されていると判定されるとステップＳ８に進む。なお、ここでは、冷却水遮断弁９は、閉じられている。   In step S7, the control means 10 determines whether or not the setting of the cooling water shutoff valve operation flag has been initialized (in an unprocessed state, for example, α = 0). If “YES” determination is made, that is, it is determined that the cooling water shutoff valve operation flag is initialized, the process proceeds to step S8. Here, the cooling water shutoff valve 9 is closed.

ステップＳ８においては、制御手段１０は、エンジン１の回転数が所定値以上であるか否かを判定する。ここで、エンジン１の回転数が所定値以上に達している場合には、“ＹＥＳ”判定となってステップＳ９に進む。   In step S8, the control means 10 determines whether or not the rotational speed of the engine 1 is equal to or greater than a predetermined value. Here, when the rotation speed of the engine 1 has reached a predetermined value or more, the determination is “YES” and the process proceeds to step S9.

ステップＳ９においては、制御手段１０は、エンジン１の冷却水温度が所定値以下であるか否かを判定する。ここで、上記冷却水温度が所定値、例えば５５℃以下であり、“ＹＥＳ”判定となるとステップＳ１０に進む。   In step S9, the control means 10 determines whether or not the coolant temperature of the engine 1 is not more than a predetermined value. Here, when the cooling water temperature is a predetermined value, for example, 55 ° C. or less, and “YES” determination is made, the process proceeds to step S10.

ステップＳ１０においては、制御手段１０は、図示省略のタイマーを始動して予め設定した所定の時間を計時する。
さらに、ステップＳ１１においては、冷却水遮断弁９を開く。そして、エンジン１から冷却水循環配管８に冷却水の一部を導き、図２に示す矢印Ｅ，Ｆ，Ｇ，Ｈ方向に冷却水を循環させる。 In step S10, the control means 10 starts a timer (not shown) and measures a predetermined time set in advance.
Further, in step S11, the cooling water shutoff valve 9 is opened. And a part of cooling water is guide | induced to the cooling water circulation piping 8 from the engine 1, and a cooling water is circulated in the arrow E, F, G, H direction shown in FIG.

ステップＳ１２においては、制御手段１０は、上記タイマーの計時が所定時間を経過したか否かを判定する。ここで、所定時間、例えば５分が経過すると、“ＹＥＳ”判定となってステップＳ１３に進む。   In step S12, the control means 10 determines whether or not the time measured by the timer has passed a predetermined time. Here, when a predetermined time, for example, 5 minutes elapses, the determination is “YES” and the process proceeds to step S13.

ステップＳ１３においては、制御手段１０は、冷却水遮断弁動作フラグを“１”（α＝１）に設定する。これは、エンジン始動時に冷却水遮断弁９が一度開かれたことを示している。そして、ステップＳ１４に進む。   In step S13, the control means 10 sets the coolant cutoff valve operation flag to “1” (α = 1). This indicates that the cooling water shut-off valve 9 has been opened once when the engine is started. Then, the process proceeds to step S14.

ステップＳ１４においては、制御手段１０は、冷却水遮断弁９を閉じ冷却水循環配管８の冷却水の循環を停止する。
一方、ステップＳ１２おいて、所定の時間が経過しておらず“ＮＯ”判定となった場合には、ステップＳ１５に進む。 In step S <b> 14, the control means 10 closes the cooling water shut-off valve 9 and stops the cooling water circulation in the cooling water circulation pipe 8.
On the other hand, if the predetermined time has not elapsed in step S12 and the determination is “NO”, the process proceeds to step S15.

ステップＳ１５においては、冷却水の温度が所定値以上になったか否かを判定する。ここで、冷却水遮断弁９を開いてから所定時間、例えば５分内に冷却水の温度が所定値、例えば６５℃以上に上昇した場合（“ＹＥＳ”判定）には、尿素水タンク６の尿素水が高温の冷却水で加熱されてアンモニアガスが生成されるのを防止するために、ステップＳ１４に進んで冷却水遮断弁９を閉じる。   In step S15, it is determined whether or not the temperature of the cooling water has reached a predetermined value or more. Here, when the temperature of the cooling water rises to a predetermined value, for example, 65 ° C. or more within a predetermined time, for example, 5 minutes after the cooling water shut-off valve 9 is opened (“YES” determination), the urea water tank 6 In order to prevent the urea water from being heated by the high-temperature cooling water and generating ammonia gas, the process proceeds to step S14 and the cooling water shut-off valve 9 is closed.

また、ステップＳ１５におてい、“ＮＯ”判定となった場合には、ステップＳ１１に戻る。この場合、ステップＳ１１では、冷却水遮断弁９は開かれているので、ステップＳ１２において、所定時間が経過したと判定されるまで冷却水遮断弁９の開状態が維持される。   If “NO” determination is made in step S15, the process returns to step S11. In this case, since the cooling water shutoff valve 9 is opened in step S11, the open state of the cooling water shutoff valve 9 is maintained until it is determined in step S12 that a predetermined time has elapsed.

ステップＳ１６においては、上記タイマーをリセットする。そして、以下、上述のステップＳ１〜Ｓ１６を繰返し実行する。なお、エンジン１が始動されていない（ステップＳ６において“ＮＯ”判定）場合、冷却水遮断弁動作フラグが初期化されていない、即ち冷却水遮断弁９が既に一度開かれている（ステップＳ７において“ＮＯ”判定）場合、エンジン１の回転数が所定数に達していない（ステップＳ８において“ＮＯ”判定）場合、またはエンジン１の冷却水温度が所定値に達していない（ステップＳ９において“ＮＯ”判定）場合にも上述のステップＳ１〜Ｓ１６が繰返し実行される。   In step S16, the timer is reset. Thereafter, the above steps S1 to S16 are repeatedly executed. If engine 1 has not been started ("NO" determination in step S6), the cooling water shutoff valve operation flag has not been initialized, that is, cooling water shutoff valve 9 has already been opened once (in step S7). If “NO” is determined, the engine 1 has not reached the predetermined number of revolutions (“NO” determination in step S8), or the cooling water temperature of the engine 1 has not reached the predetermined value (“NO” in step S9). Also in the case of “determination”, the above steps S1 to S16 are repeatedly executed.

なお、図２に示すように、冷却水は、ウォータタンク１５からエンジン１の冷却水通路に供給され（矢印Ｈ参照）、エンジン１の冷却水通路を通って矢印Ｉ方向に戻るようになっている。また、上記冷却水循環配管８の途中に気液分離タンクを備えれば、例えば冷却水を交換した際に混入した気泡を、冷却水遮断弁を開いて循環させることにより容易に取除くことができる。   As shown in FIG. 2, the cooling water is supplied from the water tank 15 to the cooling water passage of the engine 1 (see arrow H) and returns to the direction of arrow I through the cooling water passage of the engine 1. Yes. If a gas-liquid separation tank is provided in the middle of the cooling water circulation pipe 8, for example, bubbles mixed when the cooling water is replaced can be easily removed by opening the cooling water shutoff valve and circulating it. .

そして、上記実施形態においては、還元剤として尿素水を使用した場合について説明したが、これに限られず、排気を浄化するために好適な他の還元剤、例えばアンモニア水溶液を使用してもよい。   In the above embodiment, the case where urea water is used as the reducing agent has been described. However, the present invention is not limited to this, and another reducing agent suitable for purifying exhaust gas, for example, an aqueous ammonia solution may be used.

本発明による排気浄化装置の実施形態を示す概念図である。It is a conceptual diagram which shows embodiment of the exhaust gas purification apparatus by this invention. 上記排気浄化装置の要部の構成を示す説明図である。It is explanatory drawing which shows the structure of the principal part of the said exhaust gas purification apparatus. 上記排気浄化装置に備える制御手段の制御の前半部を説明するフローチャートである。It is a flowchart explaining the first half part of control of the control means with which the said exhaust gas purification apparatus is equipped. 上記排気浄化装置に備える制御手段の制御の後半部を説明するフローチャートである。It is a flowchart explaining the latter half part of control of the control means with which the said exhaust gas purification apparatus is equipped.

符号の説明Explanation of symbols

１…エンジン
３…排気管（排気通路）
４…還元触媒
６…尿素水タンク（還元剤タンク）
７…尿素水供給手段（還元剤供給手段）
５…噴射ノズル
８…冷却水循環配管
９…冷却水遮断弁
１０…制御手段 1 ... Engine 3 ... Exhaust pipe (exhaust passage)
4 ... Reduction catalyst 6 ... Urea water tank (reducing agent tank)
7: urea water supply means (reducing agent supply means)
DESCRIPTION OF SYMBOLS 5 ... Injection nozzle 8 ... Cooling water circulation piping 9 ... Cooling water shut-off valve 10 ... Control means

Claims (4)

エンジンの排気系に配設され、排気中の窒素酸化物を還元剤により還元浄化する還元触媒と、前記還元剤を貯蔵した還元剤タンクと、該還元剤タンクから還元剤供給手段を介して供給される還元剤を前記排気系の排気通路内にて前記還元触媒の排気上流側に噴射する噴射ノズルとを備えたエンジンの排気浄化装置であって、
前記エンジンにより加熱される冷却水の通路の一部を前記還元剤タンクに導いて、該還元剤タンク内に貯蔵された還元剤の凍結防止又は凍結した還元剤の解凍をする冷却水循環配管と、
該冷却水循環配管の途中に設けられ、該冷却水循環配管の通路を開閉して冷却水の循環及び循環停止をする冷却水遮断弁と、
該冷却水遮断弁の開閉動作を制御する制御手段とを備えて、
該制御手段により、エンジン始動時に所定時間だけ前記冷却水遮断弁を開き前記冷却水循環配管に冷却水を循環させることを特徴とする排気浄化装置。 A reduction catalyst disposed in the exhaust system of the engine for reducing and purifying nitrogen oxides in the exhaust with a reducing agent, a reducing agent tank storing the reducing agent, and supplied from the reducing agent tank through a reducing agent supply means An exhaust purification device for an engine, comprising an injection nozzle for injecting the reducing agent to be exhausted upstream of the reduction catalyst in the exhaust passage of the exhaust system,
A cooling water circulation pipe for guiding a part of the passage of the cooling water heated by the engine to the reducing agent tank to prevent freezing of the reducing agent stored in the reducing agent tank or to thaw the frozen reducing agent;
A cooling water shut-off valve that is provided in the middle of the cooling water circulation pipe and opens and closes the passage of the cooling water circulation pipe to circulate and stop the circulation of the cooling water;
Control means for controlling the opening and closing operation of the cooling water shutoff valve,
An exhaust emission control device characterized in that the control means opens the cooling water shut-off valve for a predetermined time when the engine is started to circulate cooling water through the cooling water circulation pipe. 前記制御手段は、前記各構成要素の所定の部位に設けられた各種センサーの検出出力に基づいて、
（ａ）エンジンの始動
（ｂ）大気温度≦所定値
（ｃ）還元剤供給手段の温度≦所定値
（ｄ）還元剤タンク内の温度≦所定値
（ｅ）エンジンの回転数≧所定値
の少なくともいずれか一つの条件が満たされていないと判断したときに、前記冷却水遮断弁を所定時間だけ開くことを特徴とする請求項１記載の排気浄化装置。 The control means is based on detection outputs of various sensors provided in predetermined portions of the respective components.
(A) Start of engine (b) Atmospheric temperature ≤ Predetermined value (c) Temperature of reducing agent supply means ≤ Predetermined value (d) Temperature in reducing agent tank ≤ Predetermined value (e) At least engine speed ≥ Predetermined value 2. The exhaust emission control device according to claim 1, wherein when it is determined that any one of the conditions is not satisfied, the cooling water shut-off valve is opened for a predetermined time. 前記制御手段は、前記エンジン始動時の所定時間内に前記冷却水の温度が所定温度以上に上昇したときには、前記冷却水遮断弁を閉じることを特徴とする請求項１又は２記載の排気浄化装置。   The exhaust purification device according to claim 1 or 2, wherein the control means closes the cooling water shut-off valve when the temperature of the cooling water rises above a predetermined temperature within a predetermined time when the engine is started. . 前記制御手段は、前記全ての条件が満たされているときには、前記冷却水遮断弁を開いて前記還元剤タンクの還元剤の凍結防止又は解凍動作をさせることを特徴とする請求項２記載の排気浄化装置。
3. The exhaust according to claim 2, wherein when all of the conditions are satisfied, the control means opens the cooling water shut-off valve to prevent the reducing agent in the reducing agent tank from being frozen or thawed. Purification equipment.
JP2004316046A 2004-10-29 2004-10-29 Exhaust purification device Expired - Fee Related JP3686670B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP2004316046A JP3686670B1 (en) 2004-10-29 2004-10-29 Exhaust purification device
PCT/JP2005/017287 WO2006046369A1 (en) 2004-10-29 2005-09-20 Exhaust gas purifier for engine
EP05785681.7A EP1806487B1 (en) 2004-10-29 2005-09-20 Exhaust gas purifier for engine
CNB2005800376146A CN100529342C (en) 2004-10-29 2005-09-20 Exhaust emission purifying apparatus for engine
US11/790,739 US7805930B2 (en) 2004-10-29 2007-04-27 Exhaust emission purifying apparatus for engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2004316046A JP3686670B1 (en) 2004-10-29 2004-10-29 Exhaust purification device

Publications (2)

Publication Number Publication Date
JP3686670B1 true JP3686670B1 (en) 2005-08-24
JP2006125331A JP2006125331A (en) 2006-05-18

Family

ID=35004098

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2004316046A Expired - Fee Related JP3686670B1 (en) 2004-10-29 2004-10-29 Exhaust purification device

Country Status (5)

Country Link
US (1) US7805930B2 (en)
EP (1) EP1806487B1 (en)
JP (1) JP3686670B1 (en)
CN (1) CN100529342C (en)
WO (1) WO2006046369A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016037931A (en) * 2014-08-08 2016-03-22 いすゞ自動車株式会社 Urea water temperature management system and urea water temperature management method

Families Citing this family (47)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005105970A (en) * 2003-09-30 2005-04-21 Nissan Diesel Motor Co Ltd Exhaust emission control device of engine
JP3687915B2 (en) * 2003-10-27 2005-08-24 日産ディーゼル工業株式会社 Liquid discrimination device
SE526072C2 (en) * 2003-12-04 2005-06-28 Volvo Lastvagnar Ab Heating device
JP4498983B2 (en) * 2005-06-10 2010-07-07 Ｕｄトラックス株式会社 Liquid reducing agent discrimination device
DE102006043098A1 (en) * 2005-11-14 2007-06-28 Robert Bosch Gmbh Method and device for temperature control in an exhaust aftertreatment system
JP4730278B2 (en) * 2006-10-20 2011-07-20 株式会社デンソー Engine exhaust purification system
JP4925890B2 (en) * 2007-03-29 2012-05-09 Ｕｄトラックス株式会社 Liquid reducing agent discrimination device and engine exhaust purification device
JP2008286096A (en) * 2007-05-17 2008-11-27 Denso Corp Exhaust gas after treatment device for internal combustion engine
DE102007024782B4 (en) * 2007-05-26 2011-08-25 Eichenauer Heizelemente GmbH & Co. KG, 76870 Heating insert and its use in a urea supply system
JP2009035644A (en) * 2007-08-02 2009-02-19 Denso Corp Antifreeze urea solution for urea selective catalytic reduction (scr) system and urea scr system
DE102007042836B4 (en) * 2007-09-10 2018-11-29 Volkswagen Ag Device for the exhaust aftertreatment of an exhaust gas stream of a motor vehicle
US7976712B2 (en) 2007-10-01 2011-07-12 Cummins Filtration Ip, Inc. Apparatus, system, and method for filtration of a dosing fluid in an exhaust aftertreatment system
JP2009097479A (en) * 2007-10-19 2009-05-07 Bosch Corp Device and method for controlling reducing agent supplying device
JP5001793B2 (en) * 2007-11-13 2012-08-15 三菱ふそうトラック・バス株式会社 Exhaust purification device
JP4445001B2 (en) * 2007-11-21 2010-04-07 株式会社日本自動車部品総合研究所 Exhaust purification device
US7966811B2 (en) * 2007-11-30 2011-06-28 Perkins Engines Company Limited Exhaust treatment system having a diverter valve
US8424777B2 (en) * 2008-02-19 2013-04-23 Caterpillar Inc. Reducing agent heating system
DE102008001709A1 (en) * 2008-05-13 2009-11-19 Robert Bosch Gmbh Apparatus, system and method for providing a reductant for a selective catalytic reduction system of nitrogen oxides
US8360052B2 (en) * 2008-09-30 2013-01-29 Martin E Nix Half parabolic dish reflector with planar reflector solar smelter
DE102008043405B4 (en) * 2008-11-03 2022-02-24 Robert Bosch Gmbh Procedure for checking the functionality of a pump
DE102009008743B4 (en) 2009-02-12 2023-06-07 Bayerische Motoren Werke Aktiengesellschaft Heating circuit for heating an ammonia storage device when the internal combustion engine is at a standstill
DE102009014831A1 (en) * 2009-03-25 2010-09-30 Daimler Ag A method of operating a reductant supply system
CN101858237B (en) * 2009-04-09 2011-11-09 博世汽车柴油系统股份有限公司 Combustion motor waste gas treatment device and cooling and/or heating device used for same
US8561392B2 (en) * 2009-06-18 2013-10-22 Cummins Ip, Inc. Apparatus, system, and method for reductant line heating control
DE102009039735A1 (en) * 2009-09-02 2011-03-03 Emitec Gesellschaft Für Emissionstechnologie Mbh Conveying device for a reducing agent with compensation element
JP5573351B2 (en) 2010-05-17 2014-08-20 いすゞ自動車株式会社 SCR system
DE102011010644A1 (en) * 2011-02-09 2012-08-09 Emitec France S.A.S Feed unit for a reducing agent
DE112011104704T5 (en) * 2011-05-16 2013-10-31 Suzhou Powergreen Emission Solution System Co., Ltd. An integrated SCR dosing and injection system
CN103201473B (en) * 2011-05-16 2015-06-03 苏州派格丽减排系统有限公司 Integrated SCR reducing agent storage device
US20130000729A1 (en) * 2011-06-30 2013-01-03 Caterpillar Inc. Def pump and tank thawing system and method
US20130026244A1 (en) * 2011-07-28 2013-01-31 Cnh America Llc Work vehicle heating system and method
US20130186349A1 (en) * 2012-01-24 2013-07-25 Caterpillar Inc. Reductant supply line heating system
JP6019754B2 (en) * 2012-05-29 2016-11-02 いすゞ自動車株式会社 Urea water thawing device
US9234445B2 (en) * 2013-06-06 2016-01-12 Cummins Emission Solutions Inc. Systems and techniques for nozzle cooling of diesel exhaust fluid injection systems
JP5979770B2 (en) * 2013-06-10 2016-08-31 ボッシュ株式会社 Control device and control method for reducing agent supply device
JP5880514B2 (en) * 2013-10-02 2016-03-09 株式会社デンソー Engine exhaust purification system
US9488088B2 (en) * 2014-05-16 2016-11-08 Komatsu Ltd. Work vehicle and method of controlling work vehicle
EP3330505B1 (en) * 2015-07-29 2019-05-22 Volvo Construction Equipment AB Device for cooling and heating urea solution for construction machine
US9664083B2 (en) * 2015-08-14 2017-05-30 Cummins Emission Solutions Inc. Virtual reductant level sensor
JP6523889B2 (en) * 2015-09-11 2019-06-05 日野自動車株式会社 Exhaust purification system
JP6729291B2 (en) * 2016-10-25 2020-07-22 いすゞ自動車株式会社 Urea water supply system and control method thereof
FR3071013B1 (en) 2017-09-12 2019-08-30 Continental Automotive France METHOD FOR PREVENTING A RISK OF FREEZING IN A REDUCING AGENT FEEDING DEVICE OF A SELECTIVE CATALYTIC REDUCTION SYSTEM
JP7109143B2 (en) * 2018-06-28 2022-07-29 ロベルト・ボッシュ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング heating system
EP3894674A4 (en) * 2018-12-14 2022-09-07 Cummins Filtration IP, Inc. Diesel fuel dosing module for regeneration of diesel particulate filters with continuous purging
CN117267006A (en) 2019-03-14 2023-12-22 康明斯有限公司 Diesel engine exhaust fluid doser protection using cylinder cut-off method under cold ambient temperature conditions
JP7238711B2 (en) * 2019-09-17 2023-03-14 いすゞ自動車株式会社 Urea solution addition system for internal combustion engine
CN114458424A (en) * 2022-01-05 2022-05-10 东风商用车有限公司 Protection method for electromagnetic valve of urea tank cooling water

Family Cites Families (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04282433A (en) 1991-03-11 1992-10-07 Snow Brand Milk Prod Co Ltd Method and apparatus for measuring concentration of liquid
JPH05222923A (en) * 1992-02-06 1993-08-31 Hino Motors Ltd Nox-in-engine-exhaust-gas reducing device by means of catalyst
DE59507350D1 (en) * 1994-09-13 2000-01-05 Siemens Ag METHOD AND DEVICE FOR INPUTING LIQUID IN AN EXHAUST GAS PURIFICATION DEVICE
JP3468254B2 (en) * 1995-10-03 2003-11-17 三菱ふそうトラック・バス株式会社 Diesel engine exhaust purification system
US6063350A (en) 1997-04-02 2000-05-16 Clean Diesel Technologies, Inc. Reducing nox emissions from an engine by temperature-controlled urea injection for selective catalytic reduction
US6399034B1 (en) * 1997-05-14 2002-06-04 Hjs Fahrzeugtechnik Gmbh & Co. Process for reducing nitrogen oxides on SCR catalyst
DE19728343C5 (en) * 1997-07-03 2013-02-21 Robert Bosch Gmbh Process and apparatus for selective catalytic NOx reduction
DE19736384A1 (en) 1997-08-21 1999-02-25 Man Nutzfahrzeuge Ag Method for metering a reducing agent into nitrogen oxide-containing exhaust gas from an internal combustion engine
DE19756251C1 (en) 1997-12-17 1999-07-22 Siemens Ag Method and device for reducing nitrogen oxides in the exhaust gas of an incineration plant
JP3855444B2 (en) 1998-03-24 2006-12-13 トヨタ自動車株式会社 Reducing agent supply device for internal combustion engine
DE19818448A1 (en) 1998-04-24 1999-10-28 Siemens Ag Catalytic reduction of nitrogen oxides in exhaust gases using judiciously dosed urea reductant
DE19827678B4 (en) * 1998-06-22 2010-05-20 Hjs Fahrzeugtechnik Gmbh & Co Emission control system for removing exhaust gases from combustion units
JP2001303934A (en) * 1998-06-23 2001-10-31 Toyota Motor Corp Exhaust emission control device for internal combustion engine
JP2000027627A (en) 1998-07-13 2000-01-25 Hino Motors Ltd Reducing agent thermal insulating device for exhaust gas cleaning catalyst, and exhaust emission control device provided with this thermal insulating device
JP2001020724A (en) 1999-07-07 2001-01-23 Isuzu Motors Ltd NOx PURIFICATION SYSTEM FOR DIESEL ENGINE
DE19933798C2 (en) 1999-07-19 2001-06-21 Siemens Ag Device and method for exhaust gas aftertreatment in an internal combustion engine
DE19935920C2 (en) * 1999-07-30 2003-04-17 Siemens Ag Device and method for heating a reducing agent reservoir of an exhaust gas aftertreatment system for an internal combustion engine
JP2002027627A (en) 2000-07-05 2002-01-25 Sumitomo Electric Ind Ltd Conductor connection tube and power cable joint using the connection tube
DE10047519A1 (en) 2000-09-22 2002-04-18 Bosch Gmbh Robert Method and device for dosing a reducing agent for removing nitrogen oxides from exhaust gases
DE10047594A1 (en) 2000-09-26 2002-04-18 Siemens Ag Method and device for determining the level of a liquid in a container
JP3600522B2 (en) * 2000-11-20 2004-12-15 トヨタ自動車株式会社 Reducing agent supply device for internal combustion engine
DE10102237A1 (en) 2001-01-19 2002-08-08 Bosch Gmbh Robert Device for dosing a urea solution
JP4270428B2 (en) 2001-06-13 2009-06-03 日産ディーゼル工業株式会社 Automatic compounding device for reducing agent solution
DE10139139A1 (en) * 2001-08-09 2003-06-12 Bosch Gmbh Robert Dosing system for dosing a reducing agent for exhaust gas aftertreatment
DE50211977D1 (en) * 2001-08-18 2008-05-08 Bosch Gmbh Robert METHOD AND DEVICE FOR STORING AND DOSING A REDUCING AGENT
DE10155675A1 (en) * 2001-08-18 2003-05-28 Bosch Gmbh Robert Method and device for storing and dosing a reducing agent
DE10207984A1 (en) * 2002-02-25 2003-10-23 Daimler Chrysler Ag A catalytic reduction system for purification of exhaust gases containing nitrogen oxides, from a vehicle internal combustion engine, is dosed with ammonia gas from a pressure vessel located in a pressure-monitored, gas-tight compartment
JP3956728B2 (en) 2002-03-11 2007-08-08 三菱ふそうトラック・バス株式会社 NOx purification device for internal combustion engine
US7065958B2 (en) 2002-05-07 2006-06-27 Extengine Transport Systems Emission control system
JP3861746B2 (en) 2002-05-17 2006-12-20 トヨタ自動車株式会社 Exhaust gas purification device for internal combustion engine
JP4199531B2 (en) 2002-12-12 2008-12-17 Ｎｅｃエンジニアリング株式会社 Pulse mask waveform shaping support device
JP2005030888A (en) 2003-07-11 2005-02-03 Mitsui Mining & Smelting Co Ltd Flow and liquid type detecting apparatus and method
JP3751962B2 (en) 2003-09-05 2006-03-08 日産ディーゼル工業株式会社 Engine exhaust purification system
EP2426329B1 (en) 2003-09-19 2013-05-01 Nissan Diesel Motor Co., Ltd. Exhaust gas purification device of engine
JP3687915B2 (en) 2003-10-27 2005-08-24 日産ディーゼル工業株式会社 Liquid discrimination device
JP3687916B2 (en) 2003-10-28 2005-08-24 日産ディーゼル工業株式会社 Engine exhaust purification system
JP3687917B2 (en) 2003-10-31 2005-08-24 日産ディーゼル工業株式会社 Liquid reducing agent concentration and remaining amount detection device
JP4375248B2 (en) 2005-02-17 2009-12-02 株式会社デンソー Driving support device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016037931A (en) * 2014-08-08 2016-03-22 いすゞ自動車株式会社 Urea water temperature management system and urea water temperature management method

Also Published As

Publication number Publication date
US7805930B2 (en) 2010-10-05
JP2006125331A (en) 2006-05-18
WO2006046369A1 (en) 2006-05-04
EP1806487A1 (en) 2007-07-11
US20070199308A1 (en) 2007-08-30
EP1806487A4 (en) 2010-06-30
CN100529342C (en) 2009-08-19
CN101052790A (en) 2007-10-10
EP1806487B1 (en) 2018-07-11

Similar Documents

Publication Publication Date Title
JP3686670B1 (en) Exhaust purification device
US8424777B2 (en) Reducing agent heating system
US5884475A (en) Method and device for introducing liquid into an exhaust-gas purification system
JP4656039B2 (en) Engine exhaust purification system
KR101260083B1 (en) System for storing an additive and for injecting it into engine exhaust gases
WO2005073527A1 (en) Device for purifying exhaust gas of internal combustion engine
US10138793B2 (en) Exhaust gas purification system and method for controlling the same
US7966811B2 (en) Exhaust treatment system having a diverter valve
JP5859651B2 (en) Exhaust purification device, method for thawing liquid reducing agent or precursor thereof
EP2065578A1 (en) Heating system for chemical used in exhaust purification system
EP1925804A1 (en) Exhaust gas purifier for engine
EP1785606A1 (en) Exhaust gas purifier
KR20150096328A (en) Combustion engine
JP2008267682A (en) Fluid heating device and exhaust gas post-treatment device equipped with same
WO2010048179A2 (en) System and method for heating a reducing agent associated with a reducing agent distribution system
JP2010065581A (en) Exhaust emission control system of internal combustion engine
JP2010185334A (en) Control device for exhaust emission control system
JP2010019134A (en) Exhaust emission control device of internal-combustion engine
GB2533099A (en) Method for providing heating to a diesel exhaust fluid (DEF) tank and diesel exhaust fluid (DEF) tank
EP2273082A1 (en) Apparatus for maintening a urea solution in a liquid state for treatment of diesel exhaust
JP2005264731A (en) Control method for exhaust emission control device
JP6062906B2 (en) Exhaust gas purification device for internal combustion engine
US20110005213A1 (en) Apparatus for Maintaining a Urea Solution in a Liquid State for Treatment of Diesel Exhaust
KR20140064111A (en) Heater of urea supply system for selective catalyst reduction device
JP4308066B2 (en) Engine exhaust purification system

Legal Events

Date Code Title Description
TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20050531

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20050603

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

Ref document number: 3686670

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20080610

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110610

Year of fee payment: 6

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110610

Year of fee payment: 6

S533 Written request for registration of change of name

Free format text: JAPANESE INTERMEDIATE CODE: R313533

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110610

Year of fee payment: 6

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110610

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140610

Year of fee payment: 9

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

S111 Request for change of ownership or part of ownership

Free format text: JAPANESE INTERMEDIATE CODE: R313113

S533 Written request for registration of change of name

Free format text: JAPANESE INTERMEDIATE CODE: R313533

R360 Written notification for declining of transfer of rights

Free format text: JAPANESE INTERMEDIATE CODE: R360

R360 Written notification for declining of transfer of rights

Free format text: JAPANESE INTERMEDIATE CODE: R360

R371 Transfer withdrawn

Free format text: JAPANESE INTERMEDIATE CODE: R371

R360 Written notification for declining of transfer of rights

Free format text: JAPANESE INTERMEDIATE CODE: R360

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

S111 Request for change of ownership or part of ownership

Free format text: JAPANESE INTERMEDIATE CODE: R313113

R360 Written notification for declining of transfer of rights

Free format text: JAPANESE INTERMEDIATE CODE: R360

R371 Transfer withdrawn

Free format text: JAPANESE INTERMEDIATE CODE: R371

R360 Written notification for declining of transfer of rights

Free format text: JAPANESE INTERMEDIATE CODE: R360

R360 Written notification for declining of transfer of rights

Free format text: JAPANESE INTERMEDIATE CODE: R360

R371 Transfer withdrawn

Free format text: JAPANESE INTERMEDIATE CODE: R371

LAPS Cancellation because of no payment of annual fees